• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 1986년도 한국자동제어학술회의논문집; 한국과학기술대학, 충남; 17-18 Oct. 1986
• /
• pp.113-118
• /
• 1986

The feedback controllers for the active vibration control of elastic systems are developed using optimal regulator, optimal tracking, time optimal and noise observer algorithms. Using the modal analysis of the elastic systems, the effects of the actuator positions, the input weighting factor and the magnitude of the constraint of the actuator force are investigated.

• 한국지반공학회논문집
• /
• 제26권1호
• /
• pp.5-19
• /
• 2010

매립지반의 지층분포는 터파기 공사 시 지층파악, 말뚝 지지층 심도 예측, 잔류 침하량 예측 등에 직접적으로 사용되는 중요한 정보이다. 이러한 지층분포는 기존의 지반조사자료를 이용하여 지구통계학적 방법인 크리깅과 이격거리에 따라 가중치를 부여하는 역거리가중치법 등을 사용하여 추정할 수 있다. 본 논문에서는 크리깅과 역거리가중치법의 추정결과의 신뢰성을 교차검증한 후 각각의 방법에서 사용되는 적정한 베리오그램 모델과 $\alpha$ 값을 제시하였다. 크리깅에서는 실험적 베리오그램에 가장 적합한 이론적 베리오그램 모델이 반드시 가장 신뢰성 높은 추정결과를 주지 않는다는 것을 알 수 있었다. 역거리가중치법에서는 지층의 형성과정에 따라 적정 $\alpha$ 값이 다르며, 풍화토가 매립층과 퇴적층보다 큰 $\alpha$ 값을 사용할 경우 신뢰성 높은 결과를 얻을 수 있었다. 크리깅의 추정결과가 역거리가중치법에 비하여 신뢰성이 높은 것으로 나타났으며, 크리깅은 베리오그램을 이용하여 지층분포의 구조를 파악할 수 있었다.

• Journal of Mechanical Science and Technology
• /
• 제15권5호
• /
• pp.535-543
• /
• 2001

This paper presents the ride comfort analysis of a vehicle based on wavelet transform. Traditionally, the objective evaluation of impact harshness is based on the vibration dose value (VDV) and frequency weighting method. These methods do not consider the damping effect of the suspension system of a vehicle. In this paper, the damping is estimated using wavelet transform based on Morlet mother wavelet and its effect is considered for the subjective evaluation of impact harshness of a car.

• 한국지능시스템학회:학술대회논문집
• /
• 한국퍼지및지능시스템학회 1997년도 춘계학술대회 학술발표 논문집
• /
• pp.248-251
• /
• 1997

In this paper, We propose the concept of approximate Classification in the field of two group discriminan analysis. In our approach, an attribute space is divided into three subspaces. Two subspaces are for given two group and one subspace is for a boundary area between the two groups. We propose Approximate Pattern Classification with Rough set. We also propose learning procedures of neural networks for approximate classification. We propose two weighting methods which lead to possibility analysis and necessity analysis. We illustrate the proposed methods by numerical examples.

• Nuclear Engineering and Technology
• /
• 제34권4호
• /
• pp.314-322
• /
• 2002

A new extrapolation method is developed and applied to the additive angular dependent rebalance (AADR) acceleration for discrete ordinates neutron transport calculations. With this extrapolation, the convergence of AADR solution for distinct discretizations between the high- order and low-order equations is remarkably improved and thus the “inconsistent discretization problem” is resolved. Fourier analysis is also performed to find the optimal extrapolation and weighting parameters, which give the smallest spectral radius. The numerical tests demonstrate that the AADR with extrapolation works well as predicted by the Fourier analysis.

• Composites Research
• /
• 제28권5호
• /
• pp.322-326
• /
• 2015

본 연구에서 고출력 LED를 개발하였고 등명기의 경량화 설계를 위한 복합재료의 적용에 대해 검토하였다. 복합재료의 적용을 통해 수직 변형량이 17% 감소하였고 전체중량은 알루미늄 소재 적용 대비 20% 감소에 해당하는 8.9 kg을 줄일 수 있었다. 방열 특성 측정 결과, 외기온도 $20^{\circ}C$ 조건에서 LED 패키지의 최고온도는 $63.5^{\circ}C$로 측정되었다. LED 패키지의 성능 및 수명을 고려할 때 적합한 온도 수준이다. 본 연구에서는 고출력 LED 등명기의 경량화를 위한 복합재료의 적용 가능성을 확인할 수 있었다.

• KIEAE Journal
• /
• 제16권5호
• /
• pp.87-92
• /
• 2016

Purpose: The objective of this research is to investigate and analyze the relationship between physical residential conditions and occupants' responses in apartment buildings by POE(Post-Occupancy Evaluation). The analysis results from this research will help to identify the indoor residential problems and find design solutions for improving overall residential indoor residential environment. Method: The occupant survey was conducted at four different apartment complex area at Cheongju City, Chungbuk Province, Korea. Combination of unbalanced indoor environmental conditions in residential building had difference of occupants' responses according to occupants' characteristics, such as gender, age, and so on. The survey collected data regarding the occupants' EQ(Environmental Quality) priorities to determine the weight of each environmental-quality factor (lighting, acoustic, thermal and indoor air quality). A paired comparison method was used to determine the weight by comparing the relative importance of the two factors based on occupant's survey response. Result: The output from this research is useful to understand the residential environment, occupants' satisfaction, preference, and identifies the current residential problems and finds an architectural solution in apartment buildings.

• 대한기계학회논문집B
• /
• 제28권7호
• /
• pp.879-886
• /
• 2004

A numerical optimization has been carried out to determine the shape of the three-dimensional channel with oblique ribs attached on both walls to enhance turbulent heat transfer. The response surface based optimization is used as an optimization technique with Reynolds-averaged Navier-Stokes analysis of fluid flow and heat transfer. Shear stress transport (SST) turbulence model is used as a turbulence closure. Numerical results fur heat transfer rate show good agreements with experimental data. four dimensionless variables such as, rib pitch-to-rib height ratio, rib height-to-channel height ratio, streamwise rib distance on opposite wall to rib pitch ratio, and the attack angle of the rib are chosen as design variables. The objective function is defined as a linear combination of heat-transfer and friction-loss related coefficients with a weighting factor. D-optimal method is used to determine the training points as a means of design of experiment. Sensitivity of the objective parameters to each design variable has been analyzed. And, optimal values of the design variables have been obtained in a range of the weighting factor.

• 한국게임학회 논문지
• /
• 제18권5호
• /
• pp.59-66
• /
• 2018

이 논문에서는 전통게임중 하나인 고누게임에 대한 구현과 실험이 수행된다. 고누게임을 구현하기 위한 기법으로 미니맥스알고리즘이 적용되었다. 미니맥스 알고리즘에 게임을 구현하기 위해 평가함수를 제안하였다. 고누게임의 구현 이후 성능향상을 위해 알파베타 가지치기에 대한 알고리즘의 효율성을 분석한다. 게임의 승패에 영향을 미치는 최적의 분석을 위해 가중치 분석이 수행되었다. 가중치 분석을 위하여, 사람과 컴퓨터의 대국, 컴퓨터와 컴퓨터의 대국으로 실험하였다. 그 결과 최적의 공격과 방어를 할 수 있는 가중치를 제시하였다.

• Journal of Electrical Engineering and Technology
• /
• 제4권1호
• /
• pp.43-48
• /
• 2009

The purpose of the this paper is to make decision of the maintenance priority of power distribution system using Time-Varying Failure Rate(TVFR) with interruption cost. This paper emphasizes the practical use of the reliability indices and interruption cost. To make a decision of maintenance priority on power distribution system equipment, the quantification of the reliability level should be represented as a cost. In this paper, the TVFR of power distribution system equipment applied in this paper utilizes analytic method to use the historical data of KEPCO. From this result, the sensitivity analysis on TVFR of equipment was done for the priority, which represents that high priority of the equipment has more effect on system reliability, such as SAIDI or SAIFI, than other equipment. By this priority, the investment plan is established. In this result, customer interruption cost(CIC) could be extracted, and CIC is used as weighting factor to consider a importance of customer. After that, the result calculated the proposal method in this paper is compared with other priority method, such as lifetime, failure rate or only sensitivity.